Wrench for screw-top jars



June 7 1927.-

F. MOSER WRENCH FORSCREW TOP JARS Filed April '7. 1926 Z Z g'M INVENTORPatented June 7, i927.

PATENT OFFICE.

FELIX MOSER. OF HOLLAND, MICHIGAN.

WRENCH FOR SCREW-TOP JARS.

Application filed April 7, 1926. Serial No. 100,337.

The invention relates to a new form of wrenchfor screw-top jars. and itconsists of a strap and a handle. as shown in the accompanying drawing.The object of the in vention is to produce a wrench for screw'top jarsthat will open them with ease and close them tightly without injuringthe cover.

Fig. 1 shows the wrench as applied to the jar cover in the act ofclosing it. It explains the direction of forces and the mechanicaladvantages.

Fig. 2 is a perspective view of the wrench loosely appliedf01'.0p6l'lll1g the jar.

The wrench consists of 'a looped strap 1 of leather or similar material,both ends of which are fastened to the same edge 6 of a handle 2 byscrews 3 or some other means.

The strap 1 is of such size that it will just lit the jar cover 4. Thescrews 3 are set back toincrease the size of the loop so that it may beslipped on with ease. The handle 2 I on the cover on applying force. asindicated which may be about the thickness of the height of the jarcover and of convenient length and breadth, has a pointed 'or bev eledend 5, this making one edge longer than the other. The strap 1 isattached to the longer edge 6, and on account of the pointed or beveledendof about 60 of the handle 1, is enabled to embrace about nine-tenthsof the circumference of the cover 4, thus securing a maximum of frictionand therefore .trated is intended to be a fruit-jar wrench,

taking a firm grip.

Mechanically the wrench has seven distinct movements or mechanicaladvantages as pointed out in Fig. 1. They are:

A. The lever from the center of the cover to the end of the handle, aforce which is common to all wrenches.

B. A circular movement of the handle, pivoting on nearest screw 3.

C. Strap following that movement tightening around the cover.

D. The tightening of the strap around the cover in the oppositedirection;

E. The leverage exerted on the strap holding that end of the strapagainst the cover. F. The amount of friction (the. grip established bythe loop of the strap around the circumference of the cover.

G. The leverage exerted tightening the strap around the cover, which isnot less than sixteen to one, after the force is applied and the pointof the handle forces the strap parts to meet at g. v

For closing: the jar the wrench is a plied as is shown in Fig. 1, forcebeing ap ied as indicated by arrow a. This causes the handle to moveslightly in the direction of arrow, 7). exerting a leverage of aboutfour to one, the nearest screw 3 being the fulcrum. The same force willtighten the strap following arrow c, and also inthe oppos1te directionfollowing" arrow (1; The handle now pivoting on the center of the circlee exerts f a leverage of sixteen to one against the cover.

holding down that end of the strap. By this time the point of'the handle'will cause the strap to shorten its loop' at g, tightening the straparound the cover with a leverage not less than sixteen to one.

Thus it can readily be seen that the grip by the arrows a becomessimultaneously absolutely locked; and as the point of the handle causesthe strap to embrace nine-' tenthsof the circumference of the cover, a

nonslip gripis established. p

' The cover can thus be tightly closed with comparative ease. Foropening the operation is reversed as indicated in Fig. 2.

While the wrench as described'and illusit is to be understood that sucha wrench may be used for other purposes and various "changes in shapemay be made without deabout sixty degrees adjacent the longer side,

and having a loop orstrap of flexible ma-' terial secured at both itsends to the said longer side of the handle, the said tapered end beingadapted to press into the bightof the loop and draw it closely aroundthe jar top thus enabling the strap to gri about nine-tenths of theobject to be turn rnnmmosnn.

